首页
登录
职称英语
Look at an atlas. How are mountains shown? Where are the highest mountains? A
Look at an atlas. How are mountains shown? Where are the highest mountains? A
游客
2023-10-17
13
管理
问题
Look at an atlas. How are mountains shown? Where are the highest mountains? A few mountains stand alone, such as Mount Egmont in New Zealand, and Mount Kenya in Africa. Most mountains are found in long chains called mountain ranges. The Pennines, the Cambrian Mountains, the Alps, the Andes and Rockies are examples of mountain ranges. The highest mountain range on the Earth is the Himalayas in Asia.
In order to understand how mountains are formed, we need to know what the inside of the Earth is like. The Earth is made up of layers of rock. The outside layer of rock, the one we live on, is called the Earth’s crust. Beneath the crust is a layer called the mantle. Near the top of the mantle, some of the rocks have melted and are a liquid, like sticky tar. Because all the rocks around it press on the mantle, the molten rock tries to force its way out. If the molten rock does find a weak spot, it bursts through the Earth’s crust, forming a volcano. Some mountains were made by volcanoes.
The Earth’s crust is made up of large pieces, called plates, which fit together like the pieces of a jigsaw puzzle. Some of the plates carry continents, others carry oceans. The plates move slowly, floating on the molten rocks of the mantle below. As the plates move, they push against each other, slowly pushing up the rocks in folds to form mountains.
India used to be a long way from Asia, but gradually the plate with India on it moved closer to the plate bearing Asia. The rocks in the sea between India and Asia were pushed up in folds that now form the Himalayan mountain range. That is why it is sometimes possible to find seashells near the tops of the Himalayas. Many other mountain ranges, including the Alps, Rockies and Pen-nines , are similar great folds of rock.
While some plates are pushing together, others are moving further apart. Europe and North America are slowly moving further apart. Each year the Atlantic Ocean is a few centimetres wider. As the rocks move, they often crack or break. These breaks are called faults. Sometimes, great blocks of rocks are pushed up between two faults. These blocks may be so large and high that they form mountains. Some of the highland areas of East Africa are block mountains, so are the Vosges mountains in France and the Sierra Nevada mountains in the western United States. Block mountains often have flat tops. A flat-topped highland is called a plateau.
Questions 56—60
Complete the following form with no more than three words according to the passage.
[br]
选项
答案
a volcano
解析
(根据第二段倒数第二句“If the molten rock does find a weak spot,it bursts through the Earth’s crust,forming a volcano.”可知答案为a volcano。)
转载请注明原文地址:https://tihaiku.com/zcyy/3105493.html
相关试题推荐
______thatthepartnershipbetweenthetwocountriesreacheditshighestpoint.A
AsItrekkedthroughthemistsoftheHuangShanmountains,Icameuponayo
______thatthetradebetweenthetwocountriesreacheditshighestpoint.A、Durin
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
WhatwillhappentotheHimalayanMountainsbytheendofthe21stcentury?[ori
随机试题
现在中国越来越盛行西式婚礼,但还是有很多年轻人选择传统中式婚礼。结婚当天,新郎要在亲朋好友的陪同下去新娘家迎娶新娘。当他们到达婚礼地点时,音乐和鞭炮声随即响
[audioFiles]audio_ehbm_j32001(20082)[/audioFiles]A、Idon’twanttogo.B、Idon’
[originaltext]M:Hey,Monica.What’sup?Lookslikeyougotsomesunthisweeke
在空气中做牛顿环实验,如图所示,当平凸透镜垂直向上缓慢平移而远离平面玻璃时,可以
功能性矫治器每天最少戴用时间为A.4~5小时 B.10~12小时 C.24小
恶性间皮瘤的瘤细胞来源于A.鳞状上皮细胞B.柱状上皮细胞C.移行上皮细胞D.间皮
护士为患急性乳腺炎的产妇讲解该病的主要病因是A.乳房过大 B.乳汁淤积 C.
下边四个图形中,只有一个是由上边的四个图形拼合(只能通过上、下、左、右平移)而成
工程网络计划中,关于各项工作之间的逻辑关系,下列叙述不正确的是( )。A.逻辑
根据《建设工程监理规范》,监理工作总结应包括的内容有( )。A.项目监理目标
最新回复
(
0
)